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//
// Copyright (C) 2020 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include <base/files/file_util.h>
#include <base/logging.h>
#include <base/strings/string_util.h>
#include <base/strings/stringprintf.h>
#include "update_engine/common/logging.h"
#include "update_engine/common/utils.h"
using std::string;
namespace chromeos_update_engine {
namespace {
constexpr char kSystemLogsRoot[] = "/var/log";
void SetupLogSymlink(const string& symlink_path, const string& log_path) {
// TODO(petkov): To ensure a smooth transition between non-timestamped and
// timestamped logs, move an existing log to start the first timestamped
// one. This code can go away once all clients are switched to this version or
// we stop caring about the old-style logs.
if (utils::FileExists(symlink_path.c_str()) &&
!utils::IsSymlink(symlink_path.c_str())) {
base::ReplaceFile(
base::FilePath(symlink_path), base::FilePath(log_path), nullptr);
}
base::DeletePathRecursively(base::FilePath(symlink_path));
if (symlink(log_path.c_str(), symlink_path.c_str()) == -1) {
PLOG(ERROR) << "Unable to create symlink " << symlink_path
<< " pointing at " << log_path;
}
}
string SetupLogFile(const string& kLogsRoot) {
const string kLogSymlink = kLogsRoot + "/update_engine.log";
const string kLogsDir = kLogsRoot + "/update_engine";
const string kLogPath =
base::StringPrintf("%s/update_engine.%s",
kLogsDir.c_str(),
utils::GetTimeAsString(::time(nullptr)).c_str());
mkdir(kLogsDir.c_str(), 0755);
SetupLogSymlink(kLogSymlink, kLogPath);
return kLogSymlink;
}
} // namespace
void SetupLogging(bool log_to_system, bool log_to_file) {
logging::LoggingSettings log_settings;
log_settings.lock_log = logging::DONT_LOCK_LOG_FILE;
log_settings.logging_dest = static_cast<logging::LoggingDestination>(
(log_to_system ? logging::LOG_TO_SYSTEM_DEBUG_LOG : 0) |
(log_to_file ? logging::LOG_TO_FILE : 0));
log_settings.log_file = nullptr;
string log_file;
if (log_to_file) {
log_file = SetupLogFile(kSystemLogsRoot);
log_settings.delete_old = logging::APPEND_TO_OLD_LOG_FILE;
#if BASE_VER < 780000
log_settings.log_file = log_file.c_str();
#else
log_settings.log_file_path = log_file.c_str();
#endif
}
logging::InitLogging(log_settings);
}
} // namespace chromeos_update_engine
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